Zuckerberg wrote key IPO filing document on his mobile phone

The Facebook CEO says he's so tied to his mobile phone that he wrote the key document in the company's IPO filing on his phone. He wouldn't say what kind of device it is.

Facebook CEO Mark Zuckerberg at TechCrunch Disrupt today. Daniel Terdiman/CNET

SAN FRANCISCO -- Facebook CEO Mark Zuckerberg is so addicted to his smart phone that, he said today, he "wrote the founder's letter in the [company's IPO filing] on my mobile phone."

Speaking at TechCrunch Disrupt here (see CNET's live blog), Zuckerberg was speaking about how tied to his mobile he is, and how important mobile is to Facebook's developers and users.

"You check in more, seeing what's going on with friends around you," he told interviewer Michael Arrington. "A lot of the energy in the developer ecosystem is...going to building great mobile experiences" and less so to building for the Web.

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